Activate the Yeast: In a small bowl, mix the warm water with the sugar and yeast. Let it sit for 5-10 minutes, until frothy.
Mix the Dough: In a large bowl, combine the flour and salt. Add the yeast mixture, vanilla extract, and olive oil. Stir until everything comes together into a sticky dough.
Knead the Dough: Transfer the dough to a floured surface and knead for about 8-10 minutes, until smooth and elastic.
Let it Rise: Place the dough in an oiled bowl, cover with a damp towel, and let it rise for 1 hour, or until doubled in size.
Shape the Dough: Punch down the dough, then transfer it to a greased baking tray. Stretch it into a rectangular shape. Let it rest for 20-30 minutes.
Bake: Preheat the oven to 180°C (350°F). Sprinkle some sugar on top of the dough. Optionally, add rosemary or berries. Bake for 25-30 minutes, or until the top is golden and sounds hollow when tapped.
Serve: Let the bread cool slightly before slicing. Serve warm for the best flavor.